You can pretty much spend as little or as much as you'd like. I can do theme parks for free if I choose not to eat there. However, if you do want a meal it'll run you about $10-$12. Drinks are around $3. Snacks are usually between $3-6 dollars depending on what you get. Are you planning on getting souvenirs? There's a huge range of prices there.
I would bring at least $10 per person if you think you might want snacks and drinks, at least. Last night I went to Mardi Gras, and all I got was a hot chocolate and a churro- it came out to $5-something.
You can pretty much spend as little or as much as you'd like. I can do theme parks for free if I choose not to eat there. However, if you do want a meal it'll run you about $10-$12. Drinks are around $3. Snacks are usually between $3-6 dollars depending on what you get. Are you planning on getting souvenirs? There's a huge range of prices there.
True plus most meal sizes allow you to share if you wanted to split something. I usually don't take more than $20 but I don't buy souvenirs except during HHN.